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Finding the Fourth Proportional to 939.13, 1,407.75 and 451.92

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Solution

The fourth proportional to 939.13, 1,407.75 and 451.92 is: 677.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.13 : 1,407.75 = 451.92 : x
  2. Step 2: Convert to fraction form
    939.13/1,407.75 = 451.92/x
  3. Step 3: Cross multiply
    939.13x = 1,407.75 × 451.92
  4. Step 4: Simplify right side
    939.13x = 636,181.08
  5. Step 5: Solve for x
    x = 636,181.08/939.13
  6. Step 6: Final answer
    x = 677.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.